Perhaps you should try some spelling variations:
phien nam » hien nay, phien ban, vien nam
hoc phien » thuoc phien, hoc nghien, hoc thieu
danh tac » canh tac, danh bac, doanh tai
hien nam » hien nay, vien nam, mien nam
tac vang » cac van, tac dong
vang hoc » van hoc, nang hoc, vung hoc
hoc phan » hoc dan, hoc pho
phan nam » pham nam, phan cam, phan ham
tac dung » sach dung, xay dung, tin dung
dung hoc » dong hoc, dung thuoc, trung hoc
hoc nhan » hoc nhanh, nhoc nhan, hoc chan
nhan nam » nhan tam, ngan nam, thanh nam
tac xa » tuc xa, tac da
xa hoc » xa hoi, va hoc, xa hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( danh tac xa hoc hien nam ) or ((( danh tac vang hoc phien nam ) or ((( danh tac vang hoc phan nam ) or ((( danh tac dung hoc phan nam ) OR ( danh tac dung hoc nhan nam ))))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( danh tac xa hoc hien nam ) OR ((( danh tac vang hoc phien nam ) OR ((( danh tac vang hoc phan nam ) OR ((( danh tac dung hoc phan nam ) OR ( danh tac dung hoc nhan nam )))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( danh tac xa hoc hien nam ) or ((( danh tac vang hoc phien nam ) or ((( danh tac vang hoc phan nam ) or ((( danh tac dung hoc phan nam ) OR ( danh tac dung hoc nhan nam ))))))))".
• Adding a wildcard symbol may retrieve word variants: (( danh tac xa hoc hien nam ) or ((( danh tac vang hoc phien nam ) or ((( danh tac vang hoc phan nam ) or ((( danh tac dung hoc phan nam ) OR ( danh tac dung hoc nhan nam ))))))))*.